Hello.
I have several systems (CentOS 3 and CentOS 4) with software raid and
I've observed a difference in the raid state:
In CentOS 3 systems we find that mdadm --detail /dev/md* show:
..............
Version : 00.90.00
Creation Time : Fri Apr 16 14:59:43 2004
Raid Level : raid1
Array Size : 20289984 (19.35 GiB 20.78 GB)
Device Size : 20289984 (19.35 GiB 20.78 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 5
Persistence : Superblock is persistent
Update Time : Thu Apr 20 15:52:50 2006
State : dirty, no-errors
<--------------------------------------------------- RAID STATE
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Number Major Minor RaidDevice State
0 33 7 0 active sync /dev/hde7
1 34 7 1 active sync /dev/hdg7
UUID : 232294aa:45bd9dea:c62face1:2fbf7a60
Events : 0.38
..........................................
while in CentOS 3 systems we find:
..................
Version : 00.90.01
Creation Time : Wed Feb 15 10:13:41 2006
Raid Level : raid1
Array Size : 76051584 (72.53 GiB 77.88 GB)
Device Size : 76051584 (72.53 GiB 77.88 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Sun Apr 23 12:48:42 2006
State : clean
<------------------------------------------------------- RAID STATE
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
UUID : 35c88d0d:0a9b5ba5:78a32da7:5d5cb1ec
Events : 0.251478
..................
Which is the difference between dirty and clean state? Both systems work
fine.